Naslov
Symmetry-breaking defect in coupled dipole-proton system of hydrogen-bonded ferroelectric

Autori
Merunka, Dalibor ; Rakvin, Boris

Izvornik
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (1386-1425) 69 (2008), 5; 1331-1336

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
hydrogen-bonded ferroelectrics ; symmetry-breaking defect ; isotope effect

Sažetak
We consider the coupled dipole-proton system of hydrogen-bonded ferroelectric crystal with one defect dipole that is coupled more strongly with the protons than the original dipole. This defect dipole simulates the symmetry-breaking defects that are often introduced in the crystals as probes in the electronic paramagnetic resonance (EPR) experiments. A particular attention is paid to the explanation of strong isotope effects that have been detected in the measurements of static and dynamic properties of the pure crystals and the symmetry-breaking defects. We suppose that the isotope effects are caused by the isotope-dependent tunneling energy and we analyze behavior of the system with and without the defect in two adiabatic approximations that correspond to the case when the protons tunnel faster than the dipoles oscillate and to the opposite case. These two approximations lead to the two models which predict different properties the pure crystals and the symmetry-breaking defects.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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